Pictures of the day: 14 January 2013

NASA's Hubble and Spitzer space telescopes have probed the stormy atmosphere of a brown dwarf named 2MASSJ22282889-431026., showing wind-driven, planet-sized clouds enshrouding these strange worlds. Brown dwarfs form out of condensing gas, as stars do, but lack the mass to fuse atoms and produce energy. Hubble and Spitzer simultaneously watched the brown dwarf as its light varied in time,Picture: NASA/Rex Features